Amid a meningitis outbreak at Princeton University, officials have decided to give students a vaccine that hasn't been approved in the United States that may stop the disease from spreading.

The Food and Drug Administration last week approved importing the vaccine Bexsero for possible use on the Ivy League school's campus. It's the only vaccine for use against the type B meningococcal bacteria, the strain implicated in the outbreak.

The vaccine is approved in Europe and Australia, where B-strain infections are more common than they are in the U.S.